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1. Product Overview

The MPL-B540K-MJ72AA is a low-inertia brushless AC rotary servo motor in the MP-Series MPL family. It is designed for industrial motion-control systems that require a combination of high rotational speed, substantial torque, accurate positioning, and absolute multi-turn feedback.

This model is a 4000 rpm configuration with a 5.4 kW rated output, approximately 19.4 N·m continuous torque, and approximately 48.6 N·m peak torque. It uses a 165 mm frame size and a 101.6 mm magnet stack, making it part of the larger B540K configuration within the MPL low-inertia motor family.

The motor is equipped with a multi-turn high-resolution absolute encoder, a keyed shaft extension, a SpeedTEC DIN right-angle connector, and no integrated holding brake. The connector can be rotated through 180°, which gives additional flexibility when routing cables inside a machine.

Compared with the B540D 2000 rpm configuration, the B540K is aimed more toward applications where higher rotational speed is important. It retains the same basic 165 mm frame and 101.6 mm stack dimensions while increasing the rated speed from 2000 rpm to 4000 rpm and increasing rated output power from approximately 3.4 kW to approximately 5.4 kW.

2. Brand and Product Series

Item	Specification
Brand	Allen-Bradley
Product family	MP-Series
Servo series	MPL Series
Motor type	Low-Inertia Brushless AC Rotary Servo Motor
Model	MPL-B540K-MJ72AA
Electrical class	460 V
AC designation	480 V AC
Rated speed	4000 rpm
Rated output	5.4 kW
Frame size	165 mm
Magnet stack	101.6 mm
Feedback	Multi-turn high-resolution absolute encoder
Shaft	Keyed shaft extension
Brake	No brake
Connector	SpeedTEC DIN
Connector orientation	Right angle
Connector rotation	180° rotatable
Mounting	IEC metric
Mounting holes	Free mounting holes, Type FF
Motor category	Low-inertia servo motor

The product identification describes the motor as a 460 V, 165 mm-frame, 101.6 mm-stack, 4000 rpm MPL servo motor with multi-turn high-resolution absolute feedback, keyed shaft, SpeedTEC DIN connector, and no brake.

3. Model Number Explanation

The model number MPL-B540K-MJ72AA provides a useful description of the motor configuration.

Model Code	Meaning
MPL	MPL low-inertia brushless servo motor family
B	460 V electrical class
540	Frame/stack family designation
K	4000 rpm speed configuration
M	Multi-turn high-resolution absolute encoder
J	Keyed shaft extension
7	SpeedTEC DIN connector
2	No brake
AA	Configuration/revision designation

The K designation is particularly important because it identifies the 4000 rpm version of the B540 configuration.

The M designation identifies the multi-turn high-resolution absolute feedback configuration.

The J indicates the keyed shaft extension.

The 7 identifies the SpeedTEC DIN right-angle connector configuration, while 2 indicates that the motor does not include a brake.

4. Main Technical Specifications

Parameter	Specification
Model	MPL-B540K-MJ72AA
Product family	MP-Series MPL
Motor type	Brushless AC rotary servo motor
Motor design	Low inertia
Electrical class	460 V
AC designation	480 V AC
Rated speed	4000 rpm
Rated output power	5.4 kW
Continuous stall torque	19.4 N·m
Peak stall torque	48.6 N·m
Continuous stall current	Approx. 20.5 A
Peak stall current	Approx. 60.0 A
Rotor inertia	Approx. 0.00147 kg·m²
Feedback	Multi-turn high-resolution absolute encoder
Encoder type	Absolute multi-turn
Shaft	Keyed shaft extension
Brake	No brake
Connector	SpeedTEC DIN
Connector style	Right angle
Connector rotation	180° rotatable
Mounting	IEC metric
Mounting holes	Free mounting holes, Type FF
Frame size	165 mm / 6.50 in
Magnet stack	101.6 mm / 4.00 in
Approximate net weight	15 kg
Overall dimensions	Verify exact mechanical drawing for final installation envelope
Typical protection	IP50 without shaft seal; higher protection available with suitable shaft-seal configuration
Operating temperature range	Approximately 0 to 40 °C

The published technical data lists 4000 rpm speed, 19.4 N·m continuous torque, 48.6 N·m peak torque, 5.4 kW output power, approximately 0.00147 kg·m² rotor inertia, and approximately 15 kg motor weight.

5. Dimensions and Mechanical Information

The principal mechanical dimensions of the MPL-B540K-MJ72AA are its 165 mm frame size and 101.6 mm magnet stack length.

The frame size is approximately 6.50 inches, while the magnet stack is approximately 4.00 inches long. The official product description identifies these dimensions directly for this model.

Mechanical Parameter	Specification
Frame size	165 mm / 6.50 in
Magnet stack length	101.6 mm / 4.00 in
Mounting standard	IEC metric
Mounting-hole configuration	Free mounting holes, Type FF
Shaft configuration	Keyed shaft extension
Connector	SpeedTEC DIN, right angle
Connector rotation	180°
Brake	None
Overall L × W × H	Refer to exact mechanical drawing
Approximate motor weight	15 kg
Shaft seal	Not standard
Cooling	Natural/convection-cooled motor construction

The approximately 15 kg figure is listed for the B540K-MJ72AA technical data. Some commercial listings report slightly different shipping or product weights, so the 15 kg value should be regarded as the nominal technical weight for engineering reference rather than a packaged shipping weight.

For final machine-layout work, the 165 mm frame and 101.6 mm stack should not be treated as the complete motor envelope. Shaft projection, connector position, cable-bend space, mounting flange, and rear motor geometry also need to be considered.

6. Electrical Characteristics

The MPL-B540K-MJ72AA belongs to the 460 V electrical class and is identified as a 480 V AC rotary servo motor configuration.

The relatively high electrical rating is appropriate for industrial servo systems designed around high-voltage motion-control equipment.

Electrical Parameter	Specification
Voltage class	460 V
AC designation	480 V AC
Rated speed	4000 rpm
Rated output power	5.4 kW
Continuous stall current	Approx. 20.5 A
Peak stall current	Approx. 60.0 A
Continuous stall torque	19.4 N·m
Peak stall torque	48.6 N·m
Feedback	Multi-turn high-resolution absolute
Brake	None
Rotor inertia	Approx. 0.00147 kg·m²

Published technical tables give approximately 20.5 A continuous stall current and 60 A peak stall current for the B540K configuration, together with 19.4 N·m continuous stall torque and 48.6 N·m peak torque.

7. Speed Performance

The MPL-B540K-MJ72AA has a rated speed of 4000 rpm.

This is one of the defining differences between the B540K and B540D versions.

The B540D is a 2000 rpm configuration, whereas the B540K is a 4000 rpm configuration. The higher speed makes the B540K more suitable for applications where rapid rotary movement, high line speed, or shorter machine cycle time is important.

Speed Parameter	Value
Rated speed	4000 rpm
Speed class	High-speed industrial servo
Rated power	5.4 kW
Continuous torque	19.4 N·m
Peak torque	48.6 N·m
Rotor inertia	0.00147 kg·m²

The combination of 4000 rpm speed and relatively low rotor inertia is useful in machines where the motor repeatedly accelerates and decelerates.

8. Torque Characteristics

The B540K configuration provides approximately 19.4 N·m continuous stall torque and approximately 48.6 N·m peak stall torque.

The continuous torque rating is important when evaluating the motor’s ability to operate under sustained load.

The peak torque rating is more relevant to short-duration acceleration, deceleration, indexing, and transient load conditions.

Torque Parameter	Specification
Continuous stall torque	19.4 N·m
Peak stall torque	48.6 N·m
Continuous-to-peak ratio	Approximately 2.5:1
Rated power	5.4 kW
Rated speed	4000 rpm

The peak torque capability is particularly useful in high-speed positioning systems where the motor must accelerate a load rapidly without requiring a larger motor frame.

9. Rotor Inertia

The rotor inertia of the B540K configuration is approximately 0.00147 kg·m².

Rotor inertia is an important servo-selection parameter because the motor itself must be accelerated and decelerated during every motion cycle.

A relatively low rotor inertia can improve dynamic response and reduce the torque required to accelerate the motor rotor.

Inertia Parameter	Value
Rotor inertia	Approx. 0.00147 kg·m²
Motor type	Low inertia
Main benefit	Rapid acceleration/deceleration response
Important design consideration	Reflected load inertia

The actual servo-system response also depends on the inertia of the connected machine, coupling, gearbox, ball screw, pulley, and other rotating or translating components.

10. Multi-Turn Absolute Encoder

The MPL-B540K-MJ72AA uses a multi-turn high-resolution absolute encoder.

This is one of its most important advantages over simpler feedback configurations.

A multi-turn absolute encoder can provide position information across multiple motor revolutions. This is useful in applications where the control system needs to know not only the angular position within one revolution but also the accumulated position over multiple revolutions.

Feedback Parameter	Specification
Feedback type	Multi-turn high-resolution encoder
Position type	Absolute multi-turn
Resolution	High-resolution
Typical protocol/configuration	Absolute servo feedback
Main advantage	Multi-revolution position information
Typical application	Precision positioning and coordinated motion

Some technical listings identify the feedback as a 1024 Sin/Cos absolute multi-turn encoder. When exact encoder resolution or protocol is important for a replacement project, the motor’s specific documentation and compatible drive configuration should be checked before ordering.

11. Keyed Shaft

The motor uses a keyed shaft extension.

The keyed shaft provides a positive mechanical interface for transmitting torque between the motor and the driven mechanism.

Shaft Parameter	Specification
Shaft configuration	Keyed shaft extension
Keyway	Yes
Shaft seal	Not standard
Typical connection	Servo coupling
Typical driven equipment	Gearbox, ball screw, pulley, rotary table
Alignment	Required

A keyed shaft is particularly convenient in industrial machinery because it is a familiar mechanical arrangement.

The coupling should still be selected specifically for servo applications and should have sufficient torsional stiffness, speed capability, and torque capacity.

12. Connector Configuration

The motor uses a SpeedTEC DIN connector with a right-angle configuration.

The connector is designed for industrial motor-cable connections and is 180° rotatable. This gives the machine designer more flexibility when positioning the motor inside a restricted mechanical space.

Connector Parameter	Specification
Connector type	SpeedTEC DIN
Orientation	Right angle
Rotation	180° rotatable
Connection arrangement	Quick-connect style
Main benefit	Flexible cable routing

The cable should be supported properly so that the connector is not subjected to continuous pulling, twisting, or excessive bending.

13. Brake Configuration

The MPL-B540K-MJ72AA has no integrated brake.

This is indicated by the final 2 in the model configuration and is explicitly listed in the product description.

Brake Parameter	Specification
Integrated brake	No
Holding brake	Not included
Brake voltage	Not applicable
Brake control wiring	Not applicable
Suitable applications	Horizontal axes and systems with external holding provisions

For vertical axes, lifting mechanisms, or other gravity-loaded applications, the machine designer must determine whether an external mechanical holding system or a brake-equipped motor configuration is required.

14. IP and Environmental Considerations

The motor is available with shaft-seal configurations that can affect environmental protection.

Technical documentation for the MJ72AA configuration lists IP50 minimum without a shaft seal, with higher protection available when the appropriate shaft seal and environmentally sealed cable connectors are used.

Environmental Parameter	Specification
Minimum protection without shaft seal	IP50
With suitable shaft-seal arrangement	Up to IP66 configuration
Operating temperature	Approximately 0 to 40 °C
Storage temperature	Approximately -30 to 70 °C
Relative humidity	5 to 95%, non-condensing
Shock	Up to 20 g peak, 6 ms
Vibration	Up to 2.5 g, depending on specified test/application conditions

The environmental configuration should be selected according to the actual machine environment. Dust, coolant, moisture, washdown exposure, and process material can all influence whether additional sealing is required.

15. Product Advantages

15.1 4000 rpm High-Speed Operation

The 4000 rpm rating is one of the strongest reasons to choose the B540K configuration.

Higher motor speed can allow a machine to achieve faster rotary movement or higher linear speed when used with an appropriate mechanical transmission.

This can be valuable in high-throughput production equipment.

15.2 5.4 kW Output

The approximately 5.4 kW output rating provides considerably more power than the 3.4 kW B540D configuration.

This makes the B540K a useful option when the machine needs higher power without moving immediately to a substantially larger motor frame.

15.3 High Peak Torque

With approximately 48.6 N·m peak torque, the B540K can provide substantial short-duration torque during acceleration and dynamic motion.

This can help in applications where rapid acceleration is an important part of the machine cycle.

15.4 Low Rotor Inertia

The approximately 0.00147 kg·m² rotor inertia supports dynamic servo operation.

Low rotor inertia is valuable for repeated starts, stops, indexing, and direction changes.

15.5 Multi-Turn Absolute Feedback

The multi-turn absolute encoder provides position information over multiple motor revolutions.

This can simplify position management in systems where multi-revolution position information is important.

15.6 Keyed Shaft

The keyed shaft is a conventional mechanical interface and can simplify integration with industrial transmission components.

15.7 Flexible Connector Orientation

The right-angle connector and 180° rotation capability provide useful flexibility in compact machine layouts.

15.8 Same Basic Frame as B540D

The B540K and B540D configurations share the 165 mm frame and 101.6 mm stack dimensions.

This can make the B540K attractive when a machine requires more speed and power but the available mechanical mounting envelope is already based on the B540 family.

16. Typical Applications

CNC and Machine Tools

The B540K can be used for high-speed positioning and feed axes where the application requires controlled movement and accurate feedback.

Its 4000 rpm speed can be useful for machine-tool axes where cycle time is important.

Packaging Machinery

Packaging machines frequently require rapid indexing, feeding, cutting, sealing, and synchronized movement.

The B540K’s combination of high speed, useful peak torque, and absolute feedback is well suited to many such motion axes.

Printing and Converting Equipment

High-speed rollers, feeding mechanisms, indexing systems, and web-handling equipment can require servo motors with fast response and precise speed control.

The B540K’s 4000 rpm rating provides useful headroom for high-speed mechanical systems.

Material Handling

The motor can be used in automated transfer systems, conveyor mechanisms, sorting equipment, and positioning units.

Its high speed can help improve machine throughput when the mechanical transmission is designed accordingly.

Electronic Assembly

Electronic assembly equipment often requires accurate, repeatable motion combined with rapid cycle times.

The high-resolution multi-turn feedback and low-inertia design can support such applications.

Robotics and Automated Machinery

The motor can be used as part of automated motion systems where precise position control and rapid axis response are required.

Rotary Indexing

Rotary indexing systems can benefit from the motor’s combination of high speed and peak torque.

The motor can rapidly move the mechanism between indexed positions when used with suitable gearing or coupling.

Ball-Screw Linear Axes

When connected to a ball screw, the motor can convert high-speed rotary motion into controlled linear movement.

The appropriate screw pitch and transmission ratio should be selected according to the required linear speed and force.

17. Application Advantages

The B540K-MJ72AA is particularly attractive when a machine needs more speed than the B540D but does not require a larger frame.

The 4000 rpm rating can shorten machine cycles.

The 5.4 kW output provides useful power for medium-to-heavy motion axes.

The multi-turn absolute encoder can provide more complete position information than a simple single-turn feedback arrangement.

The keyed shaft is mechanically familiar, while the right-angle connector makes cable routing easier in compact machinery.

Together, these features make the model suitable for a broad range of high-performance industrial automation applications.

18. Closely Related Models

The following five models are useful comparisons within the same MPL family.

Model	Rated Speed	Power	Continuous Torque	Peak Torque	Feedback	Brake	Frame / Stack
MPL-B540K-MJ72AA	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	Multi-turn absolute	No	165 / 101.6 mm
MPL-B540K-MJ74AA	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	Multi-turn absolute	24 V DC	165 / 101.6 mm
MPL-B540K-SJ72AA	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	Single-turn high-resolution	No	165 / 101.6 mm
MPL-B540K-SJ74AA	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	Single-turn high-resolution	24 V DC	165 / 101.6 mm
MPL-B540D-MJ72AA	2000 rpm	3.4 kW	19.4 N·m	41.0 N·m	Multi-turn absolute	No	165 / 101.6 mm

The first four models share the B540K 4000 rpm configuration and mainly differ in feedback and brake options. The B540D-MJ72AA retains the same basic frame and stack but changes to the 2000 rpm, 3.4 kW configuration.

19. Five Recommended Related Models

1. MPL-B540K-MJ74AA

This is the closest functional alternative to the target model.

It retains the B540K 4000 rpm configuration and multi-turn high-resolution feedback but adds a 24 V DC holding brake.

It is therefore particularly useful when the same high-speed servo performance is required together with a motor-mounted holding function.

2. MPL-B540K-SJ72AA

This model keeps the B540K 4000 rpm configuration and keyed shaft but uses single-turn high-resolution feedback instead of multi-turn absolute feedback.

It can be considered when multi-turn position information is not required.

3. MPL-B540K-SJ74AA

This version combines the 4000 rpm B540K platform with single-turn high-resolution feedback and a 24 V DC brake.

It is a useful choice for applications requiring both a holding brake and a simpler single-turn feedback configuration.

4. MPL-B540D-MJ72AA

This model retains the keyed shaft, multi-turn feedback, and no-brake configuration but reduces the rated speed to 2000 rpm and rated output to approximately 3.4 kW.

It is a useful alternative where the application prioritizes torque at moderate speed rather than high rotational speed.

5. MPL-B560F-MJ72AA

The B560F moves to a longer 152.4 mm stack and approximately 5.5 kW power class.

It provides approximately 26.8 N·m continuous torque and approximately 67.8 N·m peak torque, making it a stronger alternative when the B540K’s torque capability is insufficient.

20. Five Same-Brand Popular Model Recommendations

Model	Rated Speed	Rated Power	Continuous Torque	Peak Torque	Rotor Inertia	Approx. Weight	Frame / Stack
MPL-B520K	4000 rpm	3.5 kW	10.7 N·m	23.2 N·m	0.000783 kg·m²	9.8 kg	165 / 50.8 mm
MPL-B540D	2000 rpm	3.4 kW	19.4 N·m	41.0 N·m	0.00147 kg·m²	15.0 kg	165 / 101.6 mm
MPL-B540K	4000 rpm	5.4 kW	19.4 N·m	48.6 N·m	0.00147 kg·m²	Approx. 15 kg	165 / 101.6 mm
MPL-B560F	3000 rpm	5.5 kW	26.8 N·m	67.8 N·m	0.00213 kg·m²	20.2 kg	165 / 152.4 mm
MPL-B580F	3000 rpm	7.1 kW	34.0 N·m	87.0 N·m	0.00289 kg·m²	25.4 kg	165 / 203.2 mm

These five models provide a useful overview of the MPL low-inertia motor range, from the shorter B520K configuration through the B540 family and into the higher-torque B560F and B580F configurations.

21. Model Selection Comparison

Model	Speed Class	Power Class	Torque Level	Main Advantage
MPL-B520K	4000 rpm	3.5 kW	10.7 / 23.2 N·m	Compact high-speed configuration
MPL-B540D	2000 rpm	3.4 kW	19.4 / 41.0 N·m	Balanced torque and speed
MPL-B540K	4000 rpm	5.4 kW	19.4 / 48.6 N·m	High-speed, higher-power B540
MPL-B560F	3000 rpm	5.5 kW	26.8 / 67.8 N·m	Higher torque capability
MPL-B580F	3000 rpm	7.1 kW	34.0 / 87.0 N·m	High torque and power

The B540K is particularly attractive when 4000 rpm operation is required without moving to a larger frame size.

22. B540K Versus B540D

The B540K and B540D are closely related configurations.

Feature	MPL-B540D-MJ72AA	MPL-B540K-MJ72AA
Rated speed	2000 rpm	4000 rpm
Rated power	3.4 kW	5.4 kW
Continuous torque	19.4 N·m	19.4 N·m
Peak torque	41.0 N·m	48.6 N·m
Rotor inertia	0.00147 kg·m²	0.00147 kg·m²
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyed	Keyed
Brake	No brake	No brake
Frame	165 mm	165 mm
Stack	101.6 mm	101.6 mm

This comparison shows why the B540K is attractive for high-speed applications.

The basic frame and stack remain the same, while the K configuration provides higher rated speed and greater output power.

23. B540K-MJ72AA Versus B540K-MJ74AA

The main difference between these two models is the brake.

Feature	MPL-B540K-MJ72AA	MPL-B540K-MJ74AA
Rated speed	4000 rpm	4000 rpm
Rated power	5.4 kW	5.4 kW
Continuous torque	19.4 N·m	19.4 N·m
Peak torque	48.6 N·m	48.6 N·m
Feedback	Multi-turn absolute	Multi-turn absolute
Shaft	Keyed	Keyed
Brake	None	24 V DC
Frame	165 mm	165 mm
Stack	101.6 mm	101.6 mm

If the application does not require a holding brake, the MJ72AA is the simpler configuration.

If the application needs a motor-mounted holding brake, the MJ74AA is the more appropriate configuration.

24. B540K-MJ72AA Versus B540K-SJ72AA

The main difference is feedback.

Feature	MPL-B540K-MJ72AA	MPL-B540K-SJ72AA
Speed	4000 rpm	4000 rpm
Power	5.4 kW	5.4 kW
Continuous torque	19.4 N·m	19.4 N·m
Peak torque	48.6 N·m	48.6 N·m
Feedback	Multi-turn absolute	Single-turn high-resolution
Shaft	Keyed	Keyed
Brake	No brake	No brake
Frame	165 mm	165 mm
Stack	101.6 mm	101.6 mm

The MJ72AA should be considered when multi-turn absolute positioning is important.

The SJ72AA is more appropriate where a single-turn high-resolution feedback configuration meets the machine-control requirements.

25. Mechanical Installation

The motor should be mounted to a rigid, accurately machined mounting surface.

The mounting flange and free mounting holes should be used according to the applicable mechanical installation requirements.

The shaft must be properly aligned with the driven equipment.

Excessive shaft misalignment can create radial and axial loading that can reduce bearing life and affect servo performance.

26. Coupling Selection

A suitable precision servo coupling should normally be used between the motor shaft and the driven mechanism.

The coupling should be selected according to:

• Continuous torque.
• Peak torque.
• Maximum speed.
• Shaft diameter.
• Torsional stiffness.
• Allowable radial misalignment.
• Allowable angular misalignment.
• Allowable axial movement.
• Machine duty cycle.

Because the motor can operate at 4000 rpm, coupling speed capability is particularly important.

A coupling that is adequate for a 1500 or 2000 rpm application may not necessarily be appropriate for a 4000 rpm servo axis.

27. Ball-Screw Applications

The MPL-B540K-MJ72AA can be used to drive a ball screw through a precision coupling.

The motor’s 4000 rpm rating can be advantageous when the machine needs high linear speed.

However, the relationship between motor speed and ball-screw speed must be carefully considered.

For example, a high-pitch ball screw can produce higher linear speed but may require greater motor torque.

The machine designer therefore needs to balance screw pitch, transmission ratio, load force, acceleration, and motor torque.

28. Packaging Applications

The B540K can be a strong choice for high-speed packaging machinery.

Packaging equipment frequently performs repeated:

• Indexing.
• Feeding.
• Cutting.
• Sealing.
• Labeling.
• Positioning.
• Synchronization.

The low-inertia design and 4000 rpm speed can be useful for these repetitive high-cycle movements.

29. Material Handling Applications

Material handling systems can use servo motors for controlled acceleration, positioning, sorting, and transfer.

The B540K provides sufficient speed and power for many medium-sized automated handling axes.

For vertical handling applications, however, the absence of an integrated brake must be considered carefully.

30. Electronic Assembly Applications

Electronic assembly equipment often requires rapid and precise positioning.

The multi-turn absolute feedback can be beneficial in coordinated motion systems where the controller needs reliable position information across multiple motor revolutions.

The motor’s high-speed capability can also help reduce machine cycle times.

31. Maintenance Recommendations

Routine maintenance should include inspection of the complete motor and transmission system.

Important inspection points include:

• Mounting bolts.
• Shaft coupling.
• Shaft alignment.
• Motor cable.
• Connector condition.
• Encoder feedback.
• Bearing noise.
• Motor vibration.
• Motor temperature.
• Mechanical backlash.

Because this model has no integrated brake, there is no motor-mounted holding-brake mechanism to maintain.

32. Replacement Considerations

When replacing an MPL-B540K-MJ72AA, it is important to compare more than the motor frame.

The following items should all be checked:

Replacement Item	Required Check
Model number	Exact catalog number
Voltage	460 V class
Speed	4000 rpm
Power	5.4 kW
Continuous torque	19.4 N·m
Peak torque	48.6 N·m
Feedback	Multi-turn high-resolution absolute
Shaft	Keyed
Brake	None
Connector	SpeedTEC DIN right angle
Frame	165 mm
Stack	101.6 mm
Mounting	IEC metric
Mechanical envelope	Exact drawing
Weight	Approx. 15 kg nominal
Drive compatibility	Correct servo-drive configuration
Cable	Correct motor and feedback cable

A motor with the same frame size but a different feedback or brake configuration should not automatically be treated as an equivalent replacement.

33. Detailed Complete Parameter Table

Category	Parameter	Specification
Identification	Model	MPL-B540K-MJ72AA
Identification	Brand	Allen-Bradley
Identification	Product series	MP-Series MPL
Identification	Product type	Low-inertia brushless AC rotary servo motor
Electrical	Voltage class	460 V
Electrical	AC designation	480 V AC
Performance	Rated speed	4000 rpm
Performance	Rated power	5.4 kW
Performance	Continuous stall torque	19.4 N·m
Performance	Peak stall torque	48.6 N·m
Electrical	Continuous stall current	Approx. 20.5 A
Electrical	Peak stall current	Approx. 60.0 A
Rotor	Rotor inertia	Approx. 0.00147 kg·m²
Feedback	Encoder	Multi-turn high-resolution absolute
Shaft	Shaft type	Keyed shaft extension
Brake	Brake	No brake
Connector	Type	SpeedTEC DIN
Connector	Orientation	Right angle
Connector	Rotation	180° rotatable
Mechanical	Frame size	165 mm / 6.50 in
Mechanical	Magnet stack	101.6 mm / 4.00 in
Mechanical	Mounting	IEC metric
Mechanical	Mounting holes	Free mounting holes, Type FF
Mechanical	Shaft seal	Not standard
Mechanical	Overall dimensions	Verify exact mechanical drawing
Weight	Motor weight	Approx. 15 kg
Environment	Operating temperature	Approx. 0 to 40 °C
Environment	Storage temperature	Approx. -30 to 70 °C
Environment	Relative humidity	5 to 95%, non-condensing
Environment	Shock	Approx. 20 g peak
Environment	Vibration	Approx. 2.5 g
Protection	Basic enclosure	IP50 without shaft seal
Protection	Enhanced configuration	Up to IP66 with appropriate shaft seal and sealed connections
Application	Typical machines	Packaging, converting, material handling, assembly, CNC and automated machinery

The core performance values and nominal weight are consistent across the available technical data for the B540K configuration.

34. Main Advantages at a Glance

Advantage	Practical Benefit
4000 rpm speed	High machine-cycle potential
5.4 kW output	Strong power capability
19.4 N·m continuous torque	Suitable for sustained medium-duty loads
48.6 N·m peak torque	Strong acceleration capability
Low rotor inertia	Rapid dynamic response
Multi-turn absolute encoder	Position information over multiple revolutions
Keyed shaft	Familiar mechanical interface
Right-angle connector	Easier cable routing
180° connector rotation	Flexible installation
165 mm frame	Compact relative to its power class
101.6 mm stack	Established B540 mechanical platform
No brake	Simple configuration for non-brake axes

35. Overall Product Assessment

The MPL-B540K-MJ72AA is a high-speed, low-inertia servo motor designed for industrial motion systems where both speed and precision are important.

Its 4000 rpm rated speed makes it substantially faster than the B540D 2000 rpm configuration, while its approximately 5.4 kW rated output gives it a useful power advantage.

The approximately 19.4 N·m continuous torque and 48.6 N·m peak torque provide a useful combination for applications involving rapid acceleration and repeated motion cycles.

The multi-turn high-resolution absolute encoder is another major advantage. It allows the motor to provide multi-revolution position information, which can be important in precision positioning systems.

The 165 mm frame and 101.6 mm stack make the motor part of the B540 mechanical platform. This is especially useful when a machine already has a B540-size motor mounting arrangement but needs higher speed or higher output power.

The keyed shaft provides a conventional mechanical connection, while the right-angle SpeedTEC DIN connector and 180° rotation capability give the machine designer flexibility during installation.

One limitation is that the MPL-B540K-MJ72AA does not include a motor-mounted brake. For vertical or gravity-loaded axes, the machine designer should determine whether an external holding mechanism or a brake-equipped B540K configuration is necessary.

The model is therefore particularly well suited to high-speed packaging, converting, material-handling, assembly, machine-tool, indexing, and automated-production applications where precise multi-turn feedback and rapid motor response are required.

In practical terms, the MPL-B540K-MJ72AA can be summarized as a 460 V-class, 4000 rpm, 5.4 kW, 19.4 N·m continuous-torque, 48.6 N·m peak-torque, 165 mm-frame, 101.6 mm-stack, low-inertia servo motor with multi-turn absolute feedback, keyed shaft, SpeedTEC DIN right-angle connector, and no integrated brake.

36. Final Recommendation

For a machine requiring high-speed servo operation at approximately 4000 rpm, the MPL-B540K-MJ72AA is a strong choice within the B540 family.

It is particularly appropriate when the application requires:

• 4000 rpm operation.
• Approximately 5.4 kW output.
• Approximately 19.4 N·m continuous torque.
• Approximately 48.6 N·m peak torque.
• Multi-turn absolute feedback.
• Keyed shaft connection.
• No integrated motor brake.
• 165 mm frame size.
• 101.6 mm magnet stack.
• Flexible right-angle motor-cable connection.

For an otherwise similar motor with a holding brake, the MPL-B540K-MJ74AA is the closest comparison.

For single-turn feedback, the MPL-B540K-SJ72AA or MPL-B540K-SJ74AA configurations are more relevant.

For lower-speed operation with the same basic B540 mechanical platform, the MPL-B540D-MJ72AA is the closest alternative.

For higher torque requirements, the MPL-B560F and MPL-B580F families provide larger stack lengths and higher torque capabilities.

Overall, the MPL-B540K-MJ72AA is best suited to industrial machines that need a combination of high rotational speed, useful continuous and peak torque, low-inertia dynamic response, precise multi-turn absolute feedback, and a conventional keyed mechanical interface.